If werewolves can be wizards why couldn't vampires? Besides according to the harry potter wiki vampires can live up to 200 years away from immortality. Or what do you mean Voldemort could solve his immortality problem?

well I will proof read soon and when it comes to vampire thing, I have explaination but that will happen in the plot

you're wrong. Werewolf is a curse, Vampirism is a choice. Your sources are also wrong, J.K. Rowling never expounded vampire lore due to plotholes it would create so it was silently redacted. Just like Time Turners. I mostly read about vampires only on fanfics and can't find any solid canon details about them.

True Vampires, in all Fiction, are always at least unageing as long as they continue to feed on human blood regularly. There are, of course, variations as many as there are stars in the sky, but the foundation of vampirism is blood and immortality. This has always been the case, at least in every single piece of fiction about vampires that I have ever read. It is a plothole in the Canon Universe. If vampirism worked properly in Canon, everyone able would choose to become a Vampire (at least every rich person, as it would be easy for them to procure human blood en masse). Immortality? And all it takes is a bit of human blood a day or perhaps even only once a week? One would be a fool to not take that chance.

How is vampirism a choice but lycanthropy a curse?

werewolves can't control it, vampires need to feed and kill to turn.

Can't control it? Wolfsbane potion. Also Greyback was canonically known for targeting kids while turned, thus there is conscious decision making there. As for feeding and killing to turn? that is unfortunately not confirmed in canon. Even if it was, how many times do you think newly turned vampires would have fed on someone till they died and thus turning them? They're both curses bro

Greyback is a Lycan not a werewolf. Wolfsbane potion just make werewolves semi conscious and too expensive, Remus still have to chain himself despite drinking the potion. So you're wrong.

"A Lycan not a werewolf" that's headcanon chief, not sure what gave you the idea there's separate types in harry potter besides maybe fanfiction or some other media

like I said, Rowling never fully dived when it comes to Monster lores. She clearly got the two wrong and made Greyback a Werewolf who could control his transformation while those he bit are infected by Lycanthrophy, aka Lycans.

The author of the series got her own character wrong because she didn't stick to your previously established "monster lore" Right, okay.

now you get it.

Maybe greyback was a exception not all werewolf can control their transformation and most of the wizarding world discriminates against someone who is turned into a werewolf this happened specifically towards remus even though many students knew for nearly a year but still were afraid of him when they got to know of his werewolf status soo yeahh vampire is better route to take for immortality if they are in the hp universe than werewolf because atleast they can control themself with enough blood not lose control during every full moon

It's Leviossaaaaaaaa